Coffee-Mug Knife Sharpener
Your morning cup of joe could put a fine edge on your knife blades in a pinch.
You can thank a Scoutmaster for this tip on what to do if you find yourself with a dull knife and no sharpening tools. On the bottom of most ceramic coffee mugs is an exposed ring of uncoated ceramic.
Ceramic happens to be one of the more popular materials used to sharpen blades. While it might not bring a ruined blade back to surgical sharpness, sharpening a knife on a coffee mug can freshen the edge.
— Matt Higgins; New Milford, Conn.
From Fine Homebuilding #285
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